RFID tag device with temperature sensitive antenna
First Claim
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1. An antenna apparatus comprising:
- a first antenna tuned to a first resonant frequency to transmit and receive electromagnetic signals, said first antenna associated with a temperature sensitive material that, upon said apparatus being exposed to a particular temperature level over a predefined time interval, causes a shift in said first resonant frequency,wherein upon said apparatus being exposed to said particular temperature level over said predefined time interval, a second antenna is configured to maintain an initial resonant frequency used by the first antenna.
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Abstract
An apparatus system, and techniques for detecting temperature change are disclosed. The system includes a temperature sensitive antenna that can be included in an RFID tag device. The antenna is associated with a temperature sensitive material that, upon being exposed to a particular temperature level over a time interval, causes at least one of a change in the resonance frequency of the antenna and change in antenna signal strength (e.g., antenna gain). An RFID reader is also provided that sends commands to the tag device and determines the existence of a temperature change based on a comparison of signal strengths received on different frequencies from the antenna.
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Citations
22 Claims
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1. An antenna apparatus comprising:
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a first antenna tuned to a first resonant frequency to transmit and receive electromagnetic signals, said first antenna associated with a temperature sensitive material that, upon said apparatus being exposed to a particular temperature level over a predefined time interval, causes a shift in said first resonant frequency, wherein upon said apparatus being exposed to said particular temperature level over said predefined time interval, a second antenna is configured to maintain an initial resonant frequency used by the first antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A Radio Frequency Identification (RFID) tag device comprising:
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a substrate; an integrated circuit mounted on said substrate; and a first antenna in communication with said integrated circuit tuned to a first resonant frequency to transmit and receive electromagnetic signals, said first antenna associated with a temperature sensitive material that, upon said tag device being exposed to a particular temperature level over a predefined time interval, causes a shift in said first resonant frequency, wherein upon said tag device being exposed to said particular temperature level over said predefined time interval, a second antenna is configured to maintain an initial resonant frequency used by the first antenna. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of detecting a temperature change using electromagnetic waves comprising:
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calculating a comparison value between a first signal strength value associated with a first signal received from an RFID tag device and a second signal strength value associated with a second signal received from said RFID tag device; correlating said comparison value to a temperature difference, wherein correlating comprises; comparing said comparison value to a plurality of signal strength values associated with a plurality of temperature points; and determining said temperature level based on said comparison. - View Dependent Claims (18)
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19. A Radio Frequency Identification (RFID) system comprising:
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an RFID tag device configured to send a first signal including a first signal strength value and a second signal including a second signal strength value in response to at least one request; and a RFID reader device configured to send said at least one request to said RFID tag device, said reader device configured to i) calculate a comparison value between said first signal strength value associated with said first signal received from said tag device and said second signal strength value associated with said second signal, and ii) correlate said comparison value to a temperature level, wherein correlating comprises; comparing said comparison value to a plurality of signal strength values associated with a plurality of temperature points; and determining said temperature level based on said comparison. - View Dependent Claims (20)
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21. An RFID tag device comprising:
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a substrate; an integrated circuit; an antenna in communication with said integrated circuit and associated with a temperature sensitive material, said antenna operable in a first frequency band comprising a first number of communication channels, wherein, upon said tag device being exposed to a particular temperature level, said temperature sensitive material causes said antenna to operate in a second frequency band, said second frequency band comprising a second number of communication channels, said second number of communication channels being different from said first number of communication channels.
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22. A method comprising:
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sending a command to an RFID tag device over each of an N number of communication channels, said RFID tag device including an antenna associated with a temperature sensitive material that operates to affect a frequency of at least one of said N number of communication channels upon said tag being exposed to a particular temperature level, N being an integer value greater than 1; receiving a response to said command over each of N−
1 communication channels, said N−
1 communication channels not including said at least one communication channel affected by said temperature sensitive material; andidentifying an exceeded temperature range for said RFID tag based upon receiving said response over each of said N−
1 communication channels and non-receipt of said response over said at least one communication channel affected by said temperature sensitive material.
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Specification